These challenges unlock gears for Explosive Mods. You'll be driving a bomb-strapped vehicle which you need to maintain minimum speed if you don't want to explode. Your goal is to deliver your payload to the marked target as fast as you can and by jumping out of the vehicle in the last moment.
Unlocked by: Liberate Vis Electra
You'll take control of an ATV which can be hard to maneuver if you took it to rocky slopes or anything that can easily deter its movement. Just stick on the road until you see a ramp where you can jump off. If you managed to do a straight, perfect landing, you can reach the lighthouse in a few seconds to earn 5 gears easily in this challenge.
Unlocked by: Liberate Fortalessa
You'll be driving a rigged 4x4 to the marked location, about 400 meters away. After entering the vehicle, drive along the main road then once there are no obstacles, you can roll down the hill straight to the target to destroy it.
Liberate Laguna del Sol
You'll be controlling a rigged 4x4 here and you have to deliver the payload to a group of vehicles parked outside Porto Vena.
Liberate: Cima Leon: Transmitter
There will be several military presence on the way and there will be a chance that they'll send troops to pursue you. The best way to get a 5-gear score is by jumping over the cliffs and plowing through the fields until you reach the lighthouse where you have to deliver the payload.